Influence of different transition metals on the properties of Me–N–C (Me = Fe, Co, Cu, Zn) catalysts synthesized using SBA-15 as tubular nano-silica reactor for oxygen reduction reaction
Influence of different transition metals on the properties of Me–N–C (Me = Fe, Co, Cu, Zn) catalysts synthesized using SBA-15 as tubular nano-silica reactor for oxygen reduction reaction
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DOI：
10.1016/j.ijhydene.2016.05.223
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发表时间：
2016-12
影响因子：
7.2
通讯作者：
Luigi Osmieri;A. H. M. Videla;M. Armandi;S. Specchia
中科院分区：
文献类型：
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作者：
Luigi Osmieri;A. H. M. Videla;M. Armandi;S. Specchia
以Me(II)-酞菁(Me)为唯一前驱体分子，SBA-15二氧化硅为牺牲模板剂，合成了不同的Me-N-C催化剂。采用氮气物理吸附、FESEM、EDX、XPS、X射线衍射仪和热重-质谱仪(TGA-MS)等表征手段，考察了不同过渡金属对催化剂热解过程的影响以及最终催化剂的物化性能。在碱性条件下，通过RDE分析评估了ORR的活性和对完全4电子反应的选择性。不同Me-N-C催化剂的ORR活性由高到低的顺序为：Fe、Co、Cu、≈、H。微孔率、吡啶氮含量和裂解开始检测到H_2的温度与催化剂的ORR活性直接相关。
Different Me–N–C catalysts for oxygen reduction reaction (ORR) are synthesized using Me(II)-phthalocyanines (Me = Fe, Co, Cu, Zn) as a unique precursor molecule, and SBA-15 silica as a sacrificial template. The influence of different transition metals on the pyrolysis process and the consequent physical–chemical properties of the final catalysts were investigated using different characterization techniques such as N2physisorption, FESEM, EDX, XPS, XRD, and thermogravimetric analysis coupled with mass spectrometry (TGA-MS). The ORR activity and selectivity toward a complete 4-electrons reaction were assessed by RDE analysis in alkaline conditions. The ORR activity of the different Me–N–C catalysts decreases in the order Fe > Co > Cu > Zn ≈ H. Microporosity, pyridinic nitrogen content and temperature at which H2starts to be detected during the pyrolysis are directly related to the ORR activity of the different catalysts.